Beginning with Acrobat 7.0, execution of JavaScript through a menu event is no longer privileged. You can execute security-restricted methods through menu events in one of the following ways:

●By opening the JavaScript category of the Acrobat preferences and checking the item named “Enable Menu Items JavaScript Execution Privileges”.

I did check that item (as I mentioned above). So why can't I execute it? At any rate, the mailForm documentation says that if the first parameter is TRUE, it operates in a non-privileged state. I have been using TRUE for this question.

So someone please tell me, why won't this.mailForm(true); work in Adobe X Reader while it works if I open it in Acrobat itself?

Note that for what it's worth, I had also earlier gone to the Acrobat X Pro menu item "Manage Trusted Identities" and selected Certicates - Edit Trust and checked all the boxes including "Embedded High Privilege JavaScript" and "Privileged System Operations."